HOW TO SET WHATSAPP WEB APP IN UBUNTU / KUBUNTU

I SAW THIS
sudo -H gedit /usr/share/applications/whatsapp-webapp.desktoP
SOMEWHERE BUT MY KONSOLE SAYS THAT COMMAND NT FOUND

PLS SOMEONE TELL ME WHAT TO DO

ALSO CAN SOMEONE TELL ME IF THE WHATSAPP WEB HAVE VIDEOCALL FEATURE AVAILABLE IN IT?